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Background: To date, no specific medication has been shown to be effective in treating COVID-19. Objectives: Due to the role of medicinal plants in reducing the symptoms of viral diseases, the present study aimed to assess the efficacy of an herbal medicine package (anti-flu Pulmo-Health), prepared based on Persian traditional medicine instructions and bioinformatics studies, in reducing the symptoms of COVID-19 in outpatients. Methods: This double-blinded randomized controlled trial was conducted on 60 COVID-19 outpatients referred to the Emergency Department of Baqiyatallah Hospital in Tehran (Iran) in July-Sep. 2020. The patients were randomly assigned into two groups, the control group (receiving routine treatment and a placebo) and the intervention group (receiving routine treatment plus anti-flu Pulmo-Health syrup and supplementary drops). The intervention continued for 10 days. The primary outcomes were oxygen saturation level, respiratory rate, heart rate, frequency of coughs during day and night times, shortness of breath score (based on the SOBDA questionnaire), expectoration, as well as the frequency of dry and productive coughs. Secondary outcomes were systolic and diastolic blood pressure, body temperature, headache, nausea, and chills. Results: In this study, 55 COVID-19 patients (27 cases in the control group and 28 subjects in the intervention group) were analyzed. The mean age of the patients was 46.25 ± 12.84 years, and 65% of them were female. The two groups of patients were homogenous in terms of demographic characteristics. The results showed that COVID-19 patients who received routine treatment plus the herbal syrup and supplementary drops revealed significantly better therapeutic responses in terms of respiratory rate, oxygen saturation, expectoration (P < 0.001), frequency of dry and productive coughs (P < 0.001), frequency of coughs, and shortness of breath (P < 0.001). Conclusions: As evidenced by the results of this study, the higher therapeutic response of COVID-19 outpatients to the anti-flu herbal syrup, this medicine is recommended as a supplement to improve respiratory symptoms in COVID-19 patients. [ABSTRACT FROM AUTHOR]